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Industrial Electronics, IEEE Transactions on

Issue 4 • Date Aug 1997

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Displaying Results 1 - 19 of 19
  • Parameter sensitivity of MRAC models employed in IFO-controlled AC motor drive

    Publication Year: 1997 , Page(s): 536 - 545
    Cited by:  Papers (13)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    An investigation of the parameter sensitivities of the d-axis voltage, q-axis voltage, and the reactive power models used in model reference adaptive control (MRAC) strategy for tuning the indirect field-oriented (IFO) controller is presented. These reference models are derived from the dynamic model of the machine under the assumption that the IFO control conditions are valid. In this paper, the machine has been considered to operate under variable speed and load conditions. To improve the robustness of the MRAC strategy, a cascade parameter estimation technique has been used to track the variations in rs and σls. The experimental results obtained with the proposed estimation technique, as well as with the MRAC strategy, are presented View full abstract»

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  • Real-time detection of intermittent misfiring in a voltage-fed PWM inverter induction-motor drive

    Publication Year: 1997 , Page(s): 468 - 476
    Cited by:  Papers (60)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    This paper develops a real-time condition-monitoring algorithm for pulsewidth modulation (PWM) inverter induction-motor drives. It is designed to detect the intermittent loss of firing pulses of an individual switching device within the inverter. The mathematical model of the induction machine is linearized in the field-torque coordinates, and the misfiring of the inverter is represented by pulse functions, which have effects in both the field and torque directions. Since the fault considered is of an intermittent nature, the time-domain response of the magnetizing and the torque-producing components of the motor stator current is used to form the condition-monitoring signal. The method is adaptive to changes in the operating point during variable-speed operation. Digital simulation and laboratory experiment are utilized to illustrate the method and to evaluate the computational effort required View full abstract»

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  • A class of predictive analog filters for sensor signal processing and control instrumentation

    Publication Year: 1997 , Page(s): 565 - 570
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    A class of analog continuous-time filters is introduced, having predictive properties for specified narrow-band signal models, such as low-order polynomials or sinusoids. Such filters are designed by using model transfer functions designed in the discrete-time domain. Z-to-s-domain mapping is done using the inverse bilinear transformation. The analog filters are implemented with active-RC structures, using the state-variable structure for biquads and a single-op-amp structure for real poles and zeros. The application examples include a filter for zero-crossing detectors, polynomial predictors for sensor signal smoothing, and an optimized sixth-order ramp-tracking filter for anti-aliasing and anti-imaging in digital signal processor (DSP) systems where high selectivity is required View full abstract»

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  • Review of high-performance three-phase power-factor correction circuits

    Publication Year: 1997 , Page(s): 437 - 446
    Cited by:  Papers (96)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB)  

    This paper reviews progress in topology, control, and design aspects in three-phase power-factor correction (PFC) techniques. Different switching rectifier topologies are presented for various applications. Representative soft-switching schemes, including zero-voltage and zero-current switched pulsewidth modulated (PWM) techniques, are investigated. Merits and limitations of these techniques are discussed and illustrated by experimental results obtained on prototype converters. Control and input filter design issues are also discussed View full abstract»

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  • An elevator group control system with floor-attribute control method and system optimization using genetic algorithms

    Publication Year: 1997 , Page(s): 546 - 552
    Cited by:  Papers (27)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (156 KB)  

    A new concept is proposed for an elevator group control system which can change control settings according to individual floor utilization situations. The floor-attribute-based control method uses a combination of floor-attribute-based evaluation and car-attribute-based evaluation. Computer simulations show it can improve multiple preferential door settings at the same time. Additionally, an on-line parameter tuning method using genetic algorithms is proposed. The floor attribute control method needs several dozen control parameters to be tuned according to each building's traffic, and the proposed method can do it. The elitist-preserving strategy is an effective way to keep control stability. A diversity-recovering operation, which initializes population, excluding the elitist individual, when traffic flow data have changed, improves the following ability for transitions of utilized conditions View full abstract»

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  • Analysis of current controllers for voltage-source inverter

    Publication Year: 1997 , Page(s): 477 - 485
    Cited by:  Papers (54)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (220 KB)  

    Current-controlled pulsewidth modulated (PWM) inverters are widely used in high-performance AC drives because they give high dynamic responses in such systems. This paper presents a comparative study of several current controllers. Particular attention is paid to the hysteresis controller and the ramp-comparator controller, due to their simplicity and widespread use. An improved ramp comparator is proposed in which the current error signals are compared to three 120° phase-shifted triangular waveforms. This eliminates the zero voltage vector applied to the inverter and reduces the inherent amplitude and phase errors. Computer simulations are used to compare the performances. Fast Fourier transform technique is used to show the power spectrum of the current waveforms. Experimental results validate the simulated performances View full abstract»

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  • Wide bandwidth, large AC current probe for power electronics and EMI measurements

    Publication Year: 1997 , Page(s): 502 - 511
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    Current measurements in power electronics or in EMI domains require high-performance probes. These probes must have a very wide bandwidth, be insensitive to electromagnetic interferences, and be able to measure large direct and alternating currents (AC-DC) without distortion. This paper is limited to AC current probes. Various principles are reviewed, in particular those based on the current transformer (CT); their limitations are analyzed, and a solution based on a two-stage transformer are proposed to extend low- and high-frequency performance. It is shown that the use of new magnetic materials, such as the amorphous or the nanocrystalline, can improve large-current low-frequency operations, while preserving the smallest possible probe size. Various solutions are provided to improve high-frequency operations. Different developments are depleted; frequency and time-domain results are presented View full abstract»

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  • High-accuracy multiviewpoint stereo measurement using the maximum-likelihood method

    Publication Year: 1997 , Page(s): 571 - 578
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB)  

    We propose a new type of highly accurate multiviewpoint stereo measurement using the maximum-likelihood method. This method is used for measuring positions of facilities, such as telegraph poles on a road. In this method, a normal distribution is assumed for a measurement error on stereo image planes. First, the probability density functions of the measurement errors at the multiviewpoints are combined. Next, the combined function is expressed using both real-space coordinates and coordinate transformation parameters, which give relative viewpoint positions, and the most probable coordinates are estimated from a condition that minimizes the function. Then, the best viewpoint positions, which minimize the area of the combined error ellipse, are investigated by analyzing the variance included in the estimated coordinates, and the relationship between the number of viewpoints and the variance of the best viewpoint positions is obtained. Finally, these theoretical results are confirmed experimentally by measuring outdoor facilities View full abstract»

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  • Direct self control of induction machines fed by a double three-level inverter

    Publication Year: 1997 , Page(s): 519 - 527
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    For variable speed induction motor drives with very high power and extreme demand on the quality of torque, a novel concept of feeding an induction machine with open windings by two gate-turn-off (GTO) three-level inverters is investigated. For optimal operation with the restricted switching frequency of these high-power inverters, direct self control (DSC) is mostly suited, which is well proven with two-level and three-level inverters in traction, allowing a highly dynamic control of the induction machine. In comparison with two-level and three-level inverters, torque ripple and distortion of motor currents are efficiently reduced, while maintaining the excellent dynamic qualities of DSC View full abstract»

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  • Linear control of inverter output voltage in overmodulation

    Publication Year: 1997 , Page(s): 590 - 592
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (88 KB)  

    A novel overmodulation strategy for space-vector pulsewidth modulated (PWM) inverters is proposed. The method, which increases the range of linear control of the output voltage by 10%, is based on Fourier series representation of the reference voltage View full abstract»

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  • A general-oriented simulation technique for power electronic systems using quadratic branch voltage extrapolation

    Publication Year: 1997 , Page(s): 492 - 501
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    A new general oriented time-domain simulation technique for power electronic systems is developed. The algorithm is based on stepwise quadratic extrapolations on the branch voltages across each reactive element, together with progressive validation of the switches' operation. The power of this new technique lies in its simplicity in solving purely resistive networks for each topological configuration, generality in requiring no a priori understanding of the switching relationships and sequence of operations, inclusion of the effects of the parasitic elements, effectiveness of using computer memory and ease of implementation on a desktop computer. Several examples illustrating the generality and computational efficiency of this new approach are presented and verified with experimental measurements and other available literature View full abstract»

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  • An improved CAN fieldbus for industrial applications

    Publication Year: 1997 , Page(s): 553 - 564
    Cited by:  Papers (35)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB)  

    The controller area network (CAN) was originally developed to support cheap and rather simple automotive applications. However, because of its performance and low cost, it is also being considered in automated manufacturing and process control environments to interconnect intelligent devices, such as modern sensors and actuators. Unfortunately, CAN, in its current form, is not able to either share out the system bandwidth among the different devices fairly or to grant an upper bound on the transmission times experienced by the nodes connected to the communication medium as it happens, for instance, in the token-based networks. In this paper, two slight modifications of the basic CAN protocol are presented that satisfy the above-mentioned requirements at the expense of a very small degradation of the system's performance. Both these solutions exhibit a high degree of compatibility with those devices which have already been designed for the conventional CAN fieldbus. Besides introducing the new mechanisms, this paper also presents some performance figures obtained using a specially developed software simulator, while the behavior of the new mechanisms is compared to the traditional CAN systems, in order to see how effective they are View full abstract»

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  • Voltage control strategy for maximum torque operation of an induction machine in the field-weakening region

    Publication Year: 1997 , Page(s): 512 - 518
    Cited by:  Papers (52)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    In this paper, a novel field-weakening scheme for the induction machine is presented. The proposed algorithm, based on the voltage control strategy, ensures the maximum torque operation over the entire field-weakening region without using the machine parameters. Also, by introducing the direct field-oriented (DFO) control, which is insensitive to the variation of machine parameters in the field-weakening region, the drive system can obtain robustness to parameter variations. Moreover, the speed sensorless control can be achieved in the very-high-speed range, where the utilization of the speed sensor is limited. Experimental results for the laboratory induction motor drive system confirm the validity of the proposed control algorithm View full abstract»

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  • A start-up method for a speed sensorless stator-flux-oriented vector-controlled induction motor drive

    Publication Year: 1997 , Page(s): 587 - 590
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (92 KB)  

    This paper describes a zero-speed start-up method of a speed sensorless stator-flux-oriented direct vector-controlled induction motor drive with the help of a machine current model that does not use any speed signal. The machine starts smoothly with vector control at finite developed torque and then transitions to the standard direct vector-control mode with the voltage model signals as the speed begins to develop. The direct vector-control mode with voltage model uses programmable cascaded low-pass filters for flux-vector synthesis and enables the drive to operate from zero speed to field-weakening mode. As the drive speed falls to zero, the drive again transitions to start-up mode, so that it can be smoothly started again. The performance of the start-up scheme has been verified on a 100 kW electric vehicle drive View full abstract»

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  • A novel three-phase utility interface minimizing line current harmonics of high-power telecommunications rectifier modules

    Publication Year: 1997 , Page(s): 456 - 467
    Cited by:  Papers (119)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    Based on the combination of a three-phase diode bridge and a DC/DC boost converter, a new three-phase three-switch three-level pulsewidth modulated (PWM) rectifier system is developed. It can be characterized by sinusoidal mains current consumption, controlled output voltage, and low-blocking voltage stress on the power transistors. The application could be, e.g., for feeding the DC link of a telecommunications power supply module. The stationary operational behavior, the control of the mains currents, and the control of the output voltage are analyzed. Finally, the stresses on the system components are determined by digital simulation and compared to the stresses in a conventional six-switch two-level PWM rectifier system View full abstract»

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  • Design and performance of an electronic ballast for high-pressure sodium (HPS) lamps

    Publication Year: 1997 , Page(s): 486 - 491
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB)  

    An electronic ballast for high-pressure sodium (HPS) lamps was designed and evaluated, theoretically and experimentally. The ballast is based on the half-bridge topology and includes a high-voltage ignitor and dimming capability. It was used to drive and examine the high frequency characteristics of a commercial HPS lamp (NAV-T 150 W (SON-T), OSRAM). The experimental results reveal that, for the frequency range of this study (27-75 kHz), the lamp is free of the acoustic resonance problem. It was also found that, for the present experimental conditions, the lamp is purely resistive, and the resistance is practically independent of the power level and operating frequency. The lamp exhibited stable operation over a very large dimming range, down to about 7% of nominal power. The 2.8-kV ignition pulse was found to be sufficient for both cold and hot startup under the proposed operating conditions View full abstract»

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  • A simple approach to flux and speed observation in induction motor drives

    Publication Year: 1997 , Page(s): 528 - 535
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (192 KB)  

    The stator-flux orientation concept allows very good transient and steady-state performances in induction motor drives. However, this control strategy can be conveniently implemented only if the stator flux is correctly observed in the entire speed range. The authors have developed a simple flux observer that gives very satisfactory results, especially near zero speed, and the approach which has been followed also allows a good speed estimation. The observer has been both simulated and implemented on an experimental system that uses a single chip to control the whole drive system. The experimental results show excellent performances, despite the low computational load View full abstract»

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  • A unity power factor PWM rectifier with DC ripple compensation

    Publication Year: 1997 , Page(s): 447 - 455
    Cited by:  Papers (40)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    This paper presents a new topology for a pulsewidth modulation (PWM) rectifier which achieves unity power factor on the AC supply side and ripple reduction on the DC output side. The main circuit of this rectifier consists of a conventional PWM rectifier and a pair of additional switches. The switches and PWM rectifier are controlled such that the ripple current on the DC line is reduced, and unity power factor is achieved on the AC line. As a result, this circuit does not require a large DC capacitor or a passive LC resonant circuit. Furthermore, control of the additional switches and PWM rectifier requires only a simple control circuit. The effectiveness of this circuit was confirmed by experiments and analysis. The rectifier is useful for uninterruptible power systems (UPSs) and DC power supplies, especially for cases in which batteries are connected to the DC line View full abstract»

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  • A state model for the drying paper in the paper product industry

    Publication Year: 1997 , Page(s): 579 - 586
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    The purpose of this paper is to present a state variable model for the drying section of a paper-making machine. This model is based on the mass and energy balance relationships written for steam, paper, cylindrical heater wall, and moisture. These relationships give a set of six nonlinear partial derivative equations. The form of these equations changes somewhat from one cylindrical heater to another. The solution for this model yields the operating parameters needed to achieve the desired steam temperature while obtaining good paper drying. Boundary conditions are specified by a stochastic generator, and initial conditions are obtained by solving the static model. In this paper, the authors present only the state variable model for the paper drying, as well as comparing the obtained results with dynamic model results. Solving the set of differential equations with respect to the boundary conditions, they obtain the standard form of the state representation, which represents the dynamic version of the model used for process control. In conclusion, it can be said that the consistency of the model with experimental results seems to be reasonably good and can be used for process control View full abstract»

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Aims & Scope

IEEE Transactions on Industrial Electronics encompasses the applications of electronics, controls and communications, instrumentation and computational intelligence for the enhancement of industrial and manufacturing systems and processes.

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DISIM - Univ. degli Studi dell'Aquila
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